I have one, and it was lovely. It was huge, fluffy and I felt so cosy snuggling under it. It cost over £100, but I saw that as an investment in something that would last for winter after winter.
It didn't. It had a fully customisable control unit (again, great, as you could set it to a range of heat settings and tell it to switch off after a pre-arranged number of minutes), but this was obviously heavier than the material of the blanket itself, and it developed a hole, exposing the wiring underneath. This could have been because of sitting on it, or whatever, but only I used it, and I was careful with it, so it wasn't because of heavy use or negligence.
Anyway, I tried to fix it with both sewn repairs and then fabric glue, but nothing worked, and I'm now a bit reluctant to use it. Its lovely looks are spoiled, and I'm a bit uneasy about the fact that the wires are visible, in case I burn my skin or there is a fire risk. Much as I would love another one, I can't see how I could prevent that from happening again.